Kimi K2 Instruct 0905

Moonshot AIMCP Tool Call

moonshotai/kimi-k2-0905Open Weights

September 2025 Kimi K2 instruction update with a 256K context and improved agentic coding

Benchmark Pricing$0.60 / 1M in$2.50 / 1M out

Context: 262,144 tokens•Max Output: 98,304 tokens•Released: 2025-09-05

TECHNICAL SPECIFICATIONS

Context Window262,144262.1K tokens

Max Output98,30498.3K tokens

LicenseModified MITSelf-hostable

Input Modalities

Text

Function / Tool CallingSupported (MCP Ready)

Structured OutputsGuaranteed Schema

MODEL CONTEXT PROTOCOL (MCP) READINESS

✓ Kimi K2 Instruct 0905 natively supports OpenAI / Anthropic format tool calling and is fully compatible with MCP servers and agent loops.

MCP Context Window Recommendations

With a context capacity of 262,144 tokens, this model can handle moderately large MCP tool definitions and multi-turn conversation logs comfortably.

API CALL INVOCATION EXAMPLE

// Example: Calling Kimi K2 Instruct 0905 via OpenAI SDK
import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.MOONSHOTAI_API_KEY,
});

const response = await client.chat.completions.create({
  model: "moonshotai/kimi-k2-0905",
  messages: [{ role: "user", content: "Hello! Can you inspect MCP tools?" }],
});

console.log(response.choices[0].message.content);